How do I insert an element into XML using Linq?

Question

My XML:

<content>
    <item id="1">A</item>
    <item id="2">B</item>
    <item id="4">D</item>
</content>

I have loaded this using XML similar to:

XDocument xDoc = new XDocument(data.Value);
var items = from i in xDoc.Element("content").Elements("item")
    select i;

I want to insert another element, to end up with something like:

<content>
    <item id="1">A</item>
    <item id="2">B</item>
    <item id="3">C</item>
    <item id="4">D</item>
</content>

How do I do this using Linq2Xml?

Rubens Farias · Accepted Answer · 2010-01-25 09:02:11Z

22

Try this:

xDoc.Element("content")
    .Elements("item")
    .Where(item => item.Attribute("id").Value == "2").FirstOrDefault()
    .AddAfterSelf(new XElement("item", "C", new XAttribute("id", "3")));

Or, if you like XPath like I do:

xDoc.XPathSelectElement("content/item[@id = '2']")
    .AddAfterSelf(new XElement("item", "C", new XAttribute("id", "3")));

edited Jan 25, 2010 at 9:02

answered Jan 25, 2010 at 8:54

Rubens Farias

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2 Comments

Matt W Over a year ago

Fantastic! Thank you :) My only question now is where is the XPathSelectElement? I can't seem to find it in any of the namespaces I'm using. (I'm using System.Linq and System.Xml.Linq)

majjam Over a year ago

XPathSelectElement is in System.Xml.XPath

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